MV5089 - DTMF Generator

Plessey

Description

This input has an internal pull-up resistor to Voo.

When connected to Vss no tones are generated by any key depression allowing the keyboard to be used for purposes other than DTMF signalling.

Features

Pin-far-Pin Replacement for MK5089.
Low Standby Power.
Minimum External Parts Count.
2.75V to 10V. Operation.
2-of-8 Keyboard Input.
High Accuracy Tones Provided by 3.58MHz Crystal Oscillator.
Pin-Selectable Inhibit of Single Tone Generation Fig.1 Pin connections - top view.

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MV5089 dtmf generator by Plessey - Datasheet Preview

Datasheet Details

Part number	MV5089
Manufacturer	Plessey
File Size	163.58 KB
Description	DTMF Generator
Datasheet	MV5089 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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MV5089 MV5089 DTMF GENERATOR The MV5089 is fabricated using Plessey Semiconductors' ISO-CMOS high density technology and offers low power and wide voltage operation. An inexpensive 3.58MHz TV crystal completes the reference oscillator. From this frequency are derived 8 different sinusoidal frequencies which, when appropriately mixed, provide Dual-Tone MultiFrequency (DTMF) tones. Inputs are compatible with a standard 2-of-8 active-low keyboard and the keyboard entries determine the correct division of the reference frequency by the row and column counters. D-to-A conversion, using R-2R ladder networks, results in a 'staircase' approximation of a sinewave with low total distortion.